--- /dev/null
+
+#include <vnet/adj/adj_midchain.h>
+#include <vnet/udp/udp.h>
+
+#include <wireguard/wireguard_messages.h>
+#include <wireguard/wireguard_if.h>
+#include <wireguard/wireguard.h>
+
+/* pool of interfaces */
+wg_if_t *wg_if_pool;
+
+/* bitmap of Allocated WG_ITF instances */
+static uword *wg_if_instances;
+
+/* vector of interfaces key'd on their sw_if_index */
+static index_t *wg_if_index_by_sw_if_index;
+
+/* vector of interfaces key'd on their UDP port (in network order) */
+index_t *wg_if_index_by_port;
+
+static u8 *
+format_wg_if_name (u8 * s, va_list * args)
+{
+ u32 dev_instance = va_arg (*args, u32);
+ return format (s, "wg%d", dev_instance);
+}
+
+u8 *
+format_wg_if (u8 * s, va_list * args)
+{
+ index_t wgii = va_arg (*args, u32);
+ wg_if_t *wgi = wg_if_get (wgii);
+ u8 key[NOISE_KEY_LEN_BASE64];
+
+ key_to_base64 (wgi->local.l_private, NOISE_PUBLIC_KEY_LEN, key);
+
+ s = format (s, "[%d] %U src:%U port:%d",
+ wgii,
+ format_vnet_sw_if_index_name, vnet_get_main (),
+ wgi->sw_if_index, format_ip_address, &wgi->src_ip, wgi->port);
+
+ key_to_base64 (wgi->local.l_private, NOISE_PUBLIC_KEY_LEN, key);
+
+ s = format (s, " private-key:%s", key);
+
+ key_to_base64 (wgi->local.l_public, NOISE_PUBLIC_KEY_LEN, key);
+
+ s = format (s, " public-key:%s", key);
+
+ return (s);
+}
+
+index_t
+wg_if_find_by_sw_if_index (u32 sw_if_index)
+{
+ if (vec_len (wg_if_index_by_sw_if_index) <= sw_if_index)
+ return INDEX_INVALID;
+ u32 ti = wg_if_index_by_sw_if_index[sw_if_index];
+ if (ti == ~0)
+ return INDEX_INVALID;
+
+ return (ti);
+}
+
+static noise_remote_t *
+wg_remote_get (uint8_t public[NOISE_PUBLIC_KEY_LEN])
+{
+ wg_main_t *wmp = &wg_main;
+ wg_peer_t *peer = NULL;
+ wg_peer_t *peer_iter;
+ /* *INDENT-OFF* */
+ pool_foreach (peer_iter, wmp->peers,
+ ({
+ if (!memcmp (peer_iter->remote.r_public, public, NOISE_PUBLIC_KEY_LEN))
+ {
+ peer = peer_iter;
+ break;
+ }
+ }));
+ /* *INDENT-ON* */
+ return peer ? &peer->remote : NULL;
+}
+
+static uint32_t
+wg_index_set (noise_remote_t * remote)
+{
+ wg_main_t *wmp = &wg_main;
+ u32 rnd_seed = (u32) (vlib_time_now (wmp->vlib_main) * 1e6);
+ u32 ret =
+ wg_index_table_add (&wmp->index_table, remote->r_peer_idx, rnd_seed);
+ return ret;
+}
+
+static void
+wg_index_drop (uint32_t key)
+{
+ wg_main_t *wmp = &wg_main;
+ wg_index_table_del (&wmp->index_table, key);
+}
+
+static clib_error_t *
+wg_if_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
+{
+ vnet_hw_interface_t *hi;
+ index_t wgii;
+ u32 hw_flags;
+
+ hi = vnet_get_hw_interface (vnm, hw_if_index);
+ hw_flags = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP ?
+ VNET_HW_INTERFACE_FLAG_LINK_UP : 0);
+ vnet_hw_interface_set_flags (vnm, hw_if_index, hw_flags);
+
+ wgii = wg_if_find_by_sw_if_index (hi->sw_if_index);
+
+ wg_if_peer_walk (wg_if_get (wgii), wg_peer_if_admin_state_change, NULL);
+
+ return (NULL);
+}
+
+void
+wg_if_update_adj (vnet_main_t * vnm, u32 sw_if_index, adj_index_t ai)
+{
+ /* The peers manage the adjacencies */
+}
+
+
+/* *INDENT-OFF* */
+VNET_DEVICE_CLASS (wg_if_device_class) = {
+ .name = "Wireguard Tunnel",
+ .format_device_name = format_wg_if_name,
+ .admin_up_down_function = wg_if_admin_up_down,
+};
+
+VNET_HW_INTERFACE_CLASS(wg_hw_interface_class) = {
+ .name = "Wireguard",
+ .update_adjacency = wg_if_update_adj,
+ .flags = VNET_HW_INTERFACE_CLASS_FLAG_NBMA,
+};
+/* *INDENT-ON* */
+
+/*
+ * Maintain a bitmap of allocated wg_if instance numbers.
+ */
+#define WG_ITF_MAX_INSTANCE (16 * 1024)
+
+static u32
+wg_if_instance_alloc (u32 want)
+{
+ /*
+ * Check for dynamically allocated instance number.
+ */
+ if (~0 == want)
+ {
+ u32 bit;
+
+ bit = clib_bitmap_first_clear (wg_if_instances);
+ if (bit >= WG_ITF_MAX_INSTANCE)
+ {
+ return ~0;
+ }
+ wg_if_instances = clib_bitmap_set (wg_if_instances, bit, 1);
+ return bit;
+ }
+
+ /*
+ * In range?
+ */
+ if (want >= WG_ITF_MAX_INSTANCE)
+ {
+ return ~0;
+ }
+
+ /*
+ * Already in use?
+ */
+ if (clib_bitmap_get (wg_if_instances, want))
+ {
+ return ~0;
+ }
+
+ /*
+ * Grant allocation request.
+ */
+ wg_if_instances = clib_bitmap_set (wg_if_instances, want, 1);
+
+ return want;
+}
+
+static int
+wg_if_instance_free (u32 instance)
+{
+ if (instance >= WG_ITF_MAX_INSTANCE)
+ {
+ return -1;
+ }
+
+ if (clib_bitmap_get (wg_if_instances, instance) == 0)
+ {
+ return -1;
+ }
+
+ wg_if_instances = clib_bitmap_set (wg_if_instances, instance, 0);
+ return 0;
+}
+
+
+int
+wg_if_create (u32 user_instance,
+ const u8 private_key[NOISE_PUBLIC_KEY_LEN],
+ u16 port, const ip_address_t * src_ip, u32 * sw_if_indexp)
+{
+ vnet_main_t *vnm = vnet_get_main ();
+ u32 instance, hw_if_index;
+ vnet_hw_interface_t *hi;
+ wg_if_t *wg_if;
+
+ ASSERT (sw_if_indexp);
+
+ *sw_if_indexp = (u32) ~ 0;
+
+ /*
+ * Allocate a wg_if instance. Either select on dynamically
+ * or try to use the desired user_instance number.
+ */
+ instance = wg_if_instance_alloc (user_instance);
+ if (instance == ~0)
+ return VNET_API_ERROR_INVALID_REGISTRATION;
+
+ pool_get (wg_if_pool, wg_if);
+
+ /* tunnel index (or instance) */
+ u32 t_idx = wg_if - wg_if_pool;
+
+ wg_if->user_instance = instance;
+ if (~0 == wg_if->user_instance)
+ wg_if->user_instance = t_idx;
+
+ udp_dst_port_info_t *pi = udp_get_dst_port_info (&udp_main, port, UDP_IP4);
+ if (pi)
+ return (VNET_API_ERROR_VALUE_EXIST);
+ udp_register_dst_port (vlib_get_main (), port, wg_input_node.index, 1);
+
+ vec_validate_init_empty (wg_if_index_by_port, port, INDEX_INVALID);
+ wg_if_index_by_port[port] = wg_if - wg_if_pool;
+
+ wg_if->port = port;
+ struct noise_upcall upcall;
+ upcall.u_remote_get = wg_remote_get;
+ upcall.u_index_set = wg_index_set;
+ upcall.u_index_drop = wg_index_drop;
+
+ noise_local_init (&wg_if->local, &upcall);
+ noise_local_set_private (&wg_if->local, private_key);
+ cookie_checker_update (&wg_if->cookie_checker, wg_if->local.l_public);
+
+ hw_if_index = vnet_register_interface (vnm,
+ wg_if_device_class.index,
+ t_idx,
+ wg_hw_interface_class.index, t_idx);
+
+ hi = vnet_get_hw_interface (vnm, hw_if_index);
+
+ vec_validate_init_empty (wg_if_index_by_sw_if_index, hi->sw_if_index,
+ INDEX_INVALID);
+ wg_if_index_by_sw_if_index[hi->sw_if_index] = t_idx;
+
+ ip_address_copy (&wg_if->src_ip, src_ip);
+ wg_if->sw_if_index = *sw_if_indexp = hi->sw_if_index;
+
+ return 0;
+}
+
+int
+wg_if_delete (u32 sw_if_index)
+{
+ vnet_main_t *vnm = vnet_get_main ();
+
+ if (pool_is_free_index (vnm->interface_main.sw_interfaces, sw_if_index))
+ return VNET_API_ERROR_INVALID_SW_IF_INDEX;
+
+ vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
+ if (hw == 0 || hw->dev_class_index != wg_if_device_class.index)
+ return VNET_API_ERROR_INVALID_SW_IF_INDEX;
+
+ wg_if_t *wg_if;
+ wg_if = wg_if_get (wg_if_find_by_sw_if_index (sw_if_index));
+ if (NULL == wg_if)
+ return VNET_API_ERROR_INVALID_SW_IF_INDEX;
+
+ if (wg_if_instance_free (hw->dev_instance) < 0)
+ return VNET_API_ERROR_INVALID_SW_IF_INDEX;
+
+ wg_if_index_by_port[wg_if->port] = INDEX_INVALID;
+ vnet_delete_hw_interface (vnm, hw->hw_if_index);
+ pool_put (wg_if_pool, wg_if);
+
+ return 0;
+}
+
+void
+wg_if_peer_add (wg_if_t * wgi, index_t peeri)
+{
+ hash_set (wgi->peers, peeri, peeri);
+
+ if (1 == hash_elts (wgi->peers))
+ vnet_feature_enable_disable ("ip4-output", "wg-output-tun",
+ wgi->sw_if_index, 1, 0, 0);
+}
+
+void
+wg_if_peer_remove (wg_if_t * wgi, index_t peeri)
+{
+ hash_unset (wgi->peers, peeri);
+
+ if (0 == hash_elts (wgi->peers))
+ vnet_feature_enable_disable ("ip4-output", "wg-output-tun",
+ wgi->sw_if_index, 0, 0, 0);
+}
+
+void
+wg_if_walk (wg_if_walk_cb_t fn, void *data)
+{
+ index_t wgii;
+
+ /* *INDENT-OFF* */
+ pool_foreach_index (wgii, wg_if_pool,
+ {
+ if (WALK_STOP == fn(wgii, data))
+ break;
+ });
+ /* *INDENT-ON* */
+}
+
+void
+wg_if_peer_walk (wg_if_t * wgi, wg_if_peer_walk_cb_t fn, void *data)
+{
+ index_t peeri, val;
+
+ /* *INDENT-OFF* */
+ hash_foreach (peeri, val, wgi->peers,
+ {
+ if (WALK_STOP == fn(wgi, peeri, data))
+ break;
+ });
+ /* *INDENT-ON* */
+}
+
+
+static void
+wg_if_table_bind_v4 (ip4_main_t * im,
+ uword opaque,
+ u32 sw_if_index, u32 new_fib_index, u32 old_fib_index)
+{
+ wg_if_t *wg_if;
+
+ wg_if = wg_if_get (wg_if_find_by_sw_if_index (sw_if_index));
+ if (NULL == wg_if)
+ return;
+
+ wg_peer_table_bind_ctx_t ctx = {
+ .af = AF_IP4,
+ .old_fib_index = old_fib_index,
+ .new_fib_index = new_fib_index,
+ };
+
+ wg_if_peer_walk (wg_if, wg_peer_if_table_change, &ctx);
+}
+
+static void
+wg_if_table_bind_v6 (ip6_main_t * im,
+ uword opaque,
+ u32 sw_if_index, u32 new_fib_index, u32 old_fib_index)
+{
+ wg_if_t *wg_if;
+
+ wg_if = wg_if_get (wg_if_find_by_sw_if_index (sw_if_index));
+ if (NULL == wg_if)
+ return;
+
+ wg_peer_table_bind_ctx_t ctx = {
+ .af = AF_IP6,
+ .old_fib_index = old_fib_index,
+ .new_fib_index = new_fib_index,
+ };
+
+ wg_if_peer_walk (wg_if, wg_peer_if_table_change, &ctx);
+}
+
+static clib_error_t *
+wg_if_module_init (vlib_main_t * vm)
+{
+ {
+ ip4_table_bind_callback_t cb = {
+ .function = wg_if_table_bind_v4,
+ };
+ vec_add1 (ip4_main.table_bind_callbacks, cb);
+ }
+ {
+ ip6_table_bind_callback_t cb = {
+ .function = wg_if_table_bind_v6,
+ };
+ vec_add1 (ip6_main.table_bind_callbacks, cb);
+ }
+
+ return (NULL);
+}
+
+/* *INDENT-OFF* */
+VLIB_INIT_FUNCTION (wg_if_module_init) =
+{
+ .runs_after = VLIB_INITS("ip_main_init"),
+};
+/* *INDENT-ON* */
+
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
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